A. the destination for most commercial payloads B. a few hundred kilometers above the earth C. about 36,000 kilometers away above the earth D. a few hundred kilometers above the stationary orbit 参考答案:D 答案解析:细节题。 [解析] 根据文章第五段第二句“很多商业有效荷载的目的地要么是现在已经很拥挤的固定轨道——许多卫星涌向这一距离地球赤道上空3万6千公里的地方挤占一席之地;要么奔向距离赤道上空只有几百公
第11题: [单项选择]The most effective warming treatment for a crew member suffering from hypothermia is(). A. running or jumping to create heat B. lying in the sun C. a warm water bath D. mouth-to-mouth resuscitation 参考答案:C